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STEAM BOILER. No. 463,805. Patented Nov. Z4, 1891.

. I Z315 gif-l 'UNITED STATES- PATENT OFFICE.

DANIEL P. MCQUEEN, OF SOHENEOTADY, NEIV YORK, ASSIGNOR TO SARAH M.MCQUEEN, OF SAME PLACE.

STEAlVl.-BO|LER.

SPECIFICATION forming part of Letters Patent No. 463,805, dated November24, 1891.

Application filed July 11, 1891. Serial No. 399,222. (No model.)

To @ZZ whom, it may concern:

Be it known that I, DANIEL P. MCQUEEN, a citizen of the United States,residing at Schenectady, in the county of Schenectady and State of NewYork, have invented certain new and useful Improvements inSteam-Boilers, of which the following is a specification.

My invention relates to that class of steamboilers which involves theuse of water-tubes.

The object of my invention is to provide improved means for securing thetubes to the boiler-shell and for closing their ends.

My improvements are illustrated in the accompanying drawings, in which-Figure 1 is a detail view in section showing the manner of securing aboiler-tube to the boiler-shell in accordance with my invention. Fig. 2is a similar view of a moditlcation. Fig. 3 is a similar view showingthe manner of closing a hand-hole in a boiler in which the tubes extendthrough the inner sheet of the shell. v

I propose to connect all the tubes to the boiler-shell in the same way,and therefore do not deem it necessary to illustrate the arrangement ofthe tubes, my invention relating to the improved device for connectingthe tube to the shell and for closing the end thereof.

In Fig. 1 the tube T is shown as extending through the inner and outersheets A A of the boiler-shell. As shown, the tube is provided withlateral openings t, so that there may be a free circulation of waterbetween the tubes and the water-space in the shell. The tube is securedto the sheet A in any preferred way. The opening a in the outer sheet Ais made somewhat larger than the tube. lVithin the opening ct and aroundthe end of the tube is interposed a ferrule B, and this ferrule receivesa cap O, which closes the end of the tube. The ferrule is shown asformed with an inwardly-projecting flange h, which may be made totightly tit the opening c, and which may have its inner end ilanged orbeaded at h. The inner bore of the flange h corresponds with the sizeot' the tube T, which it closely tits.

At h2 the ferrule is provided with a shoulder which rests against theouter face of the sheet A', and from this part of the ferrule projectsoutwardly a flange h3, which, as shown,

is screw-threaded on its interior to receive the screw-threaded ange cof the cap O. The ferrule, as shown, is provided with a shoulder b4,adapted to receive a flange't, projecting outwardly from the end of thetube. This flange may be formed by tools usually used for analogouspurposes.

By my improvements the necessity for screw-threading the boiler-sheetsand the tubes is avoided, and a tight joint is formed between theboiler-sheet and the tubes. The tubes may also be more readily removedin my boiler than in those in which screw-threads are employed or inwhich the tubes are expanded directly in the boiler-head, as it will beobserved vthat in my boiler the ferrules need not be removed. and thetubes need not be expanded in the ferrules.

Should a leak occur between the tube and the ferrule, the water willreturn to the tube after having passed over the end t of the tube. Noleak is likely to occur betw en the ferrule and the sheet A', as theferrule is permanently attached thereto.

In Fig. 2 I have shown a slight modification. The cap C fits ascrew-thread formed on the outside of theferrule, instead of beingformed on the inside thereof, and the tube T is eX- panded at fr.Otherwise the construction is the same as that shown in Fig. 1.

In Fig. 3 the ferrule and cap are the same as that shown in Fig. 1; butthe tube T terminates in the inner sheet, this figure serving f toillustrate how the ferrule and cap may be used to close a hand-hole,which I sometimes employ.

I claim as my invention- 1. The combination of a tube, a boiler-shell, aferrule extending through an opening in the boiler-shell and having ashoulder resting against the face of the front sheet of the boiler, anda screw-cap secured to the f'errule and closing the opening in theboiler-shell.

2. The combination of a boiler-shell, a ferrule having a flangeextending through an opening in the boiler-shell and beaded on its innerend, a shoulder resting against the face of the front sheet of theboiler-shell, and a screw-cap secured to the ferrule and closing itsend.

3. The combination of a tube, a boilershell,

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a ferruie extending through nu opening in the boiler-shell and having nshoulder resting` against the fuee of the front sheet of the boiler, :itube having its end arranged within 5 the ferrule, and a cap secured tothe ferrnie and closing the end of the tube.

4. The combination of a boiler-shell, a tube extending through the innerand outer sheets thereof and having a lateral opening between 1o thesheets, a beaded shouidered ferruie extending through an openingin thefront sheet and surrounding the outer end of thetube, and a sereweapfitting the ferruie and closing' the tube.

In testimony whereof I have hereunto Subi5 scribed my name.

DANIEL P. MCQUEEN. XVitllesses:

HARRY W. DENNINGTON, FRANK L. SANTEE.

